How to select last record or first record value in a formula?

Post Author: d111
CA Forum: General
I am using a query in a report that in addition to other columns, has a column of month labels like:
There are no unique identifiers or sequence fields that can be used. There is only 4 columns: the label and 3 percent columns.
Jan07Feb07Mar07Apr07etc.
I would like to show the range of months I am using in a label on the report showing the last and first records value. like: "Jan07 to Jun07".
I can not see how to use the functions maximun or minimum since it sorts the months alphabetically.
I would like to use a formula to just grab the first and last record. I can't seem to find any information on this anywhere.
Please advise and thanks.

Post Author: bettername
CA Forum: General
Hmm... I suspect what you actually want is the minimum and maximum dates in the report, rather than the first and last records (even if they do happen to come out in date order). So you need to convert the text dates to real ones, and then pick the min/max values.
If so, try these:
Formula "ConvertToDate" (for details section) which converts your text field into a real date - suppress it once placed!:
//Since you have 2-digit years, this conversion assumes that all your dates are >=year 2000
numbervar the_month;if left({YourTable.YourField},3) = "Jan" then the_month:=1 elseif left({YourTable.YourField},3) = "Feb" then the_month:=2 elseif left({YourTable.YourField},3) = "Mar" then the_month:=3 elseif left({YourTable.YourField},3) = "Apr" then the_month:=4 else
//...etc etc you fill in the rest!
if left({YourTable.YourField},3) = "Dec" then the_month:=12;
date(tonumber("20"+right({YourTable.YourField},2)), the_month, 1);
Formula "Show Date Range" (for anywhere on the report) to show the min/max values of the dates;
totext (minimum({@ConvertToDate})) + " to "+totext(maximum({@ConvertToDate}))
If, however, you really just want the first and last records, and you want it at the top of your report as a title (eg: in the Report Header), then I can't see how it can be done without using a subreport that looks at the same dataset, but only displays the first and last records (using the formulas below).
Stick this in the details section, and call it "HoldRecords" and suppress it:
whileprintingrecords;stringvar first;stringvar last;if recordnumber = 1 then first:={YourTable.YourField}; //if its the first record that crystal is displaying, store it in a variableif recordnumber = count({YourTable.YourField}) then last :={YourTable.YourField} //and again, but for the last record
Now create another formula, and put it into the report footer:
evaluateafter({@HoldRecords});stringvar first" to "stringvar last //will display "Jan07 to Apr07"
NOTE: if you have the report ordered by anything, this'll throw the record numbering, and therefore the first and last records, therefore... urgh.
Hope this helps...

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